Written by Matthew Cannata Marcus Thigpen has been the Dolphins kickoff and punt returner the past two seasons but he now finds himself on the roster bubble. This became more apparent on Wednesday when we learned that Jarvis Landry and Damian Williams are the top two challengers for that position. “We put a depth chart up. Is [Thigpen] number one? Yes, because he has the most experience,” special teams coordinator Darren Rizzi said. “We will have other guys do it. We have a lot of options, a lot of competition. We have some insurance policies like Brent Grimes.” Thigpen should be most concerned about Landry, who the coaches love not only in their offensive sets, but also in the special teams phase of the game. “Obviously, the guy has good hands,” Rizzi said. “He has good judgment, very good athletic ability. The question of whether he can do it in game time is going to be the biggest thing. He’s going to have some opportunities for sure [in preseason games]. He didn’t do it a lot in college [at LSU]. They had Odell Beckham doing it.”